High resolution X-ray spectroscopy of plasma irradiated by ultra-short laser pulses with intensities of 10 W/cm

10 W/cmの集光強度で超短パルスレーザーで照射されたプラズマの高分解X線分光

Faenov, A.*; Hansen, S. B.*; Colgan, J.*; Abdallah, J.*; Pikuz, T.; Pikuz, S. A.*; Skobelev, I. Y.*; 西内 満美子; 榊 泰直; 前田 祥太; 匂坂 明人; Pirozhkov, A. S.; 小倉 浩一; 福田 祐仁; 金崎 真聡; 松川 兼也*; 長谷川 登; 錦野 将元; 神門 正城; 山内 知也*; 渡辺 幸信*; Zhidkov, A.*; 河内 哲哉; 近藤 公伯

Faenov, A.*; Hansen, S. B.*; Colgan, J.*; Abdallah, J.*; Pikuz, T.; Pikuz, S. A.*; Skobelev, I. Y.*; Nishiuchi, Mamiko; Sakaki, Hironao; Maeda, Shota; Sagisaka, Akito; Pirozhkov, A. S.; Ogura, Koichi; Fukuda, Yuji; Kanasaki, Masato; Matsukawa, Kenya*; Hasegawa, Noboru; Nishikino, Masaharu; Kando, Masaki; Yamauchi, Tomoya*; Watanabe, Yukinobu*; Zhidkov, A.*; Kawachi, Tetsuya; Kondo, Kiminori

We present new set of measurements of high spectrally resolved K-shell spectra of Al and Fe plasma obtained by thin foils irradiation using 40 fs laser pulses of J-KAREN laser facility with intensities up to 10 W/cm. Dependences of X-ray spectra from laser energy and thicknesses of foils were investigated. Measured power-law dependence of X-ray intensity vs laser beam intensity confirmed that at laser intensities higher than 10 W/cm Radiation Dominated regime could be reached. Two independent models are used to provide a detail theoretical study of the various configurations and processes roles in the formation of the observed spectra. Modeling demonstrated strong influence of X-ray photo pumping from laser-produced plasma for intensity and structure of observed X-ray spectra.